Improvement in ratchet-drills



IT a S Hamilton D A 1n lmpt RATGHET DRILLs BATBNTIm-JUL 11 1871 ylnventcvlm b UNITED STATES PATENT OEEIOE.

IEA s. HAMILTON, OE HAMILTON, OHIO.

IMPROVEMENT [N RATCHETK-VDRILLS.

Specification forming part of Letters Patent No. 116,955, dated July 11,1871.

To all whom it may concern:

Be it known that I, IRA S. HAMILTON, of Hamilton, Butler county, Stateof Ohio, have invented certain new and useful Improvements inRatchet-Drills, of which the following is a specification:

My invention consists of a certain construction of ratchet hand-drill,which provides for the operation of "the handle in different angles orpositions to suit the work or the requirements of the operator, theconstruction also being such that the drill can be revolved by acontinuous rotary motion or by an intermittent rotary motion, in whichthe movement of the hand-lever in either direction serves to rotate thedrill, or by an intermittent rotary motion, in which the movement of thelever in one direction only rotates the drill. My invention furtherconsists of a screw, sleeve, and peculiar connecting device for feedingthe drill to the work.

Figure l is a perspective view of a drill enibodying my invention. Fig.2 is a plan of the` ratchet device.

The drill-spindle Ais constructed with a socket, a, for the drill, and afeeding-screw, a. It has also secured to it a ratchet-wheel, B, abovethe upper bevel-wheel, and a ratchet-wheel, C, cut in the samedirection, below the lower bevelwheel. The lower ratchet-wheel C is seenin Fig. 2, which represents the under side of the lower bevel-wheel.Between the ratchet-wheels B C the two bevel or miter-wheels D E arefitted to revolve loosely on spindle A. Each wheel carries a pawl, F,and spring G, to keep the pawl engaged in the teeth of the ratchetexcept when backing. Between the bevel or miter-wheels D E a frame, H,is fitted loosely tothe spindle Av in the manner shown, the frame havinga journal, I, attached, on which an intermediate wheel,

Aratchet mechanism, and notched at the lower edge, at d, to iit over astud, e, on the wheel D. The sleeve L can be raised so as to be detachedfrom the pin or stud e, and in this position it may be supported byset-screw M. When the sleeve is so supported the feed is inoperative,eX- cept by hand in the usual way, viz., by revolving' the nut K. Thewheel E and wheel J are each provided with a socket, N and Nf. The frameH is provided 'with two apertures, h h', for the reception of the forkedhandle orlever l), which, when the hand-lever R which works the drill isiitted to the socket N and a movement of the drill is required for eachmotion of the lever, must be used, in the manner shown in the drawing,to prevent a revolution of the frame H.

When the drill is operated by the attachment of the operating-lever B tothe socket N, and withoutthe employment of the forked handle l), thedrill is not fed automatically, and merely rotates when the lever R ismoved in one direction, Vhen the drill is operated by the lever R Ainsocket N, and the handle P is employed in the manner shown, the drillrotates with each motion of the lever, and is then fed automatically ifthe sleeve is in contact with stud c. When the lever R is used in socketN the drill can be rotated continuously by turning the handle in eitherdirection. In place ofthe notch-and-stud device d c to feedautomatically, the sleeve L may have ratchet-teeth. upon it, and theoutside of wheel D be provided with an elastic pawl to iit the teeth,which would be adapted to feed less as the pressure upon the drillincreased.v

I claiml. A ratchet hand-drill, constructed substantially as hereindescribed, vin which the intermediate wheel J and the wheel E have eacha handle-socket, N and N', respectively, and the loose frame H, whichsupports the intermediate wheel, is provided with the means shown, ortheir equivalents, for holding it stationary, all in the manner and forthe purposes set forth.

2. In a ratchet hand-drill, constructed substantially as hereindescribed, the automatic feeding mechanism composed of the screwthreadedspindle a', nut K c, sleeve L b d, and stud c of the wheel D, operatingin the manner set forth.

In testimony of which invention I hereunto set my hand.

IRA S. HAMILTON.

Witnesses:

FRANK MILLWARD, Jon E. OWENS.

